Math CentralQuandaries & Queries


Question from Lucy:

Find the area of the the figure described: a semicircle with arc length 3 pi.

Hi Lucy,

What is the formula for the circumference of a circle of radius $r?$ Half of that is the length of the semicircular arc which you know is $3 \pi.$ Solve for $r.$ Now you know the radius of the circle, what is its area? What is the area of the semicircle?


About Math Central


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.
Quandaries & Queries page Home page University of Regina PIMS